ASTM D6442-03

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Designation: D 6442 – 03
Standard Test Method for
Determination of Copper Release Rate From Antifouling
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Coating Systems in Artificial Seawater
This standard is issued under the fixed designation D 6442; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope priate safety practices and to determine the applicability of
regulatory limits prior to use. For specific hazard statements,
1.1 This test method covers the laboratory determination of
see Section 7.
the rate at which copper is released from an antifouling coating
in synthetic seawater using graphite furnace atomic absorption
2. Referenced Documents
spectrophotometry (GF-AAS).
2.1 ASTM Standards:
1.2 The procedure contains the preparation steps for the
D 1005 Test Method for Measurement of Dry-Film Thick-
leach rate determination of copper from antifouling paints
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ness of Organic Coatings Using Micrometers
including apparatus, reagents, holding tank conditions, and
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D 1141 Specification for Substitute Ocean Water
samplingpointdetails.Analysisfortheconcentrationofcopper
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D 1193 Specification for Reagent Water
inseawaterrequirestheaccuratedeterminationofcopperatthe
low parts per billion (ppb) level. To detect and correct for
3. Summary of Test Method
reagent impurities, acceptable analytical precision standards
3.1 The candidate paint system is applied to cylindrical test
are necessary. Therefore, the limit of quantitation for the
specimens. The coated specimens are placed in a tank of
analytical method should be 6 ppb or less. The method of
synthetic seawater where the copper levels are kept below 100
choice for most commonly available instrument with the
µg/Lbycirculatingtheseawaterthroughanabsorbentfilterand
greatest sensitivity would be GF-AAS. This procedure is
an activated carbon filter.At specified intervals, each specimen
written to include necessary steps to isolate the copper from
isplacedin1500mLofseawater(seeSection9fordetails)and
seawater, thereby increasing sensitivity and eliminating salts
rotated 60 r/min for 1 h (or less, see 9.8 for further explanation
that interfere with the use of atomic absorption techniques.
and instruction). The rate of copper release from the paint is
1.3 Other analytical methods may be utilized with appro-
determined by measuring copper concentrations of the seawa-
priate procedural changes, as needed, to accommodate selected
ter in the individual measuring containers.
specific methods. Such methods must meet the limit of
3.2 Analysis of the seawater for copper is conducted by
quantition (6 ppb) as presented in Section 13.
extracting the copper with a solid state absorbent, elution with
1.4 This test method has not yet been validated to reflect
10 % HNO , and measuring for copper using GF-AAS.
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in-situ copper release rates for antifouling products and there-
fore should not, at present, be used in the process of generating
4. Significance and Use
environmental risk assessments. In-service release rates of
4.1 This test method is designed to provide a laboratory
antifouling (AF) coatings are expected to vary with natural
procedure to measure changes in the release rates of copper
variability in seawater chemistry, temperature, and hydrody-
that occur during a period of immersion under specified
namic regime.
conditions of constant temperature, pH, salinity, and low
1.5 The values stated in SI units are to be regarded as
copper concentrations in the surrounding seawater. Quantita-
standard. The inch-pound units given in parentheses are for
tive measurement of the release rate is necessary to help in
information only.
selection of materials, in providing quality control, and in
1.6 This standard does not purport to address all of the
understanding the performance mechanism.
safety concerns, if any, associated with its use. It is the
4.2 This test method serves only as a guide for character-
responsibility of the user of this standard to establish appro-
ization of the early release pattern as well as estimating the
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
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Subcommittee D01.45 on Marine Coatings. Annual Book of ASTM Standards, Vol 06.01.
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Current edition approved May 10, 2003. Published July 2003. Originally Annual Book of ASTM Standards, Vol 11.02.
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approved in 1999. Last previous edition approved in 1999 as D 6642 - 99. Annual Book of ASTM Standards, Vol 11.01.
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